Thanks for clarifying that shadowsun farsight thing Sterling191
The rules we know on markerlights so far from the leak, i have separated it into 3 sections; The default rules, special rules and Using Markerlights :
The default rules:
Fire Markerlights is an action (not part of the shooting phase any more).
One or more Markerlight units from your army can start to perform this action at the start of your movement phase.
The action is completed at the start of your next shooting phase.
If this action is successfully completed, for each model in that unit that is equipped with one or more markerlights, for each markerlight that model is equipped with, select one enemy unit within 36" of that model that would be an eligible target for that model if its unit had been selected to shoot, and roll one
D6: on a 3+, that enemy unit gains one Markerlight token.
The list of special rules to this:
Aircraft Markerlight units can perform this action.
VEHICLE or DRONE keyword units performing the Fire Markerlights action can move without that action failing.
If it does, until the end of the turn, models in that unit without the VEHICLE or DRONE keyword that are equipped with any markerlights are treated as not being equipped with any markerlights for the purpose of the Fire Markerlights action.
Pathfinders can move then apply Markerlights.
Using Markerlights up:
Markerlights only affect Tau Empire unit shooting (not Aux units, kroot or vespid).
Each time a model in that Tau Empire unit makes a ranged attack against a unit with one or more Markerlight Tokens, add 1 to that attack's hit roll.
After that Tau Empire unit has finished making its shooting attacks, for each enemy unit targeted by those attacks, remove one Markerlight token from that enemy unit.
Remove all Markerlight tokens at the end of your shooting phase.
(Farsight Enclaves always have Markerlight if making attacks within 12", even in other phases).
The default rules are fairly clear.
The using markerlights is fairly clear.
The issue is the special rule exemptions.
A lot of the rules for the markerlight stipulate movement.
It seems most people are swapping the word move for normal move in there minds, and i dont think that this is correct.
On the topic of the movement phase it should contain;
Normal Move
Advance
Remain Stationary
Fall Back
Reinforcements
Typically the "move units" is Normal Move, Advance, Remain Stationary, Fall Back
The Reinforcements is typically taken in the next step of the movement phase
This implies to me that 'move' includes Normal Move, Advance, Remain Stationary, Fall Back ... and maybe Reinforcements, only for Pathfinders as they can do markerlights at end of movement phase (which may include the Reinforcements).
I dont care about Reinforcements and think the rules would clarify if you can or not and I dont think there would be too much use case for that. So i am ignoring that.
Remain Stationary is the status the units have if they dont do any of the other movement phase options (which is included in the montka for turns 1-3). So I am arguing that montka does affect the markerlights action for all units that did a ‘normal move’ or ‘advance’, if we start redefining the remains stationary then we will break the game VERY quickly.
The montka wording is:
“Each time this unit makes a Normal Move or Advances in your movement phase, it counts as having remained stationary” – from the
GW website.
In this context:
The pathfinders are the only ones who can “Pathfinders can move then apply Markerlights”. I still think that that means they can ‘move’ being fallback, and then apply Markerlights so other units can shoot into the target unit as well.
I have not heard an argument that makes sense (without breaking the game) that would prevent them from doing this.
The wording of the leak is not the best, other aspects of it use the word 'move' and it is assumed that it is 'normal move' by everyone:
"There is a stratagem that allows a unit to hop out of a devilfish after the devilfish moves". Again I think that this is normal move only (as it would be far too powerful otherwise) and would allow units in devil fish to stage an ork like rush (devilfish 12" normal move, strike/pathfinder team 6-7" move =18">19" of normal move into the enemy deployment and cause havoc there, like charging or blocking paths to delay units).
On disembarking there is the rule "they never count as having Remained Stationary", not sure how that applies to montka and which one takes precedent.
Unless osomeone can clarify that in one line thats a whole new argument i dont want to dip a toe in right now.
Ignoring the incorrect word 'move' (that shouldnt exist in rules like this) it is clear:
Aircraft units have to
move (for example Remora Stealth Drones have markerlights and movement between 15" and 30"

and they can still perform the Markerlights action. (Ignoring 'move', clear and no objections).
VEHICLE or DRONE keyword units performing the Fire Markerlights action can
move without that action failing. (Ignoring 'move', again clear and no objections).
If it does, until the end of the turn, models in that unit without the VEHICLE or DRONE keyword that are equipped with any markerlights are treated as not being equipped with any markerlights for the purpose of the Fire Markerlights action. (again clear and no objections).
Pathfinders can
move then apply Markerlights. (Ignoring 'move', again clear and no objections).
Automatically Appended Next Post: The Markerlights actions are performed in the tau turn from the start / end of the moment phase, depending on the unit and rules, though the psychic phase (for all that psychic that tau are busy doing
lol) and are completed before the start of shooting phase.
This is a very short window and few things would affect it
The rules on declaring the actions do state:
“You can declare a unit from your army to perform an action provided there are no enemy units within Engagement Range of it and it did not Advance or Fall Back this turn.”
Actions are reported to fail if:
If a unit is destroyed (not relevant to this action as something is not likely to get destroyed between movement and shooting phase).
makes a Normal Move, Advances, Falls Back (point of discussion here, prearticular Advances and Fall Back for the pathfinders or just Fall Back in the case on montka).
attempts to manifest a psychic power (again we are tau here, who are you kidding?)
The action then completes and the rest is irrelevant.
(declares a charge, performs a Heroic Intervention or makes any attacks with ranged weapons are all irrelevant).
A character unit cannot use any aura abilities while it is performing an action (if the action is failed, their aura abilities immediately take effect again).
This is not really applicable to tau cases as drones are often the unit with markerlight in character models and most auras are in shooting phase.
First montka means Normal Move and Advances counts as Remains Stationary for the first 3 turns … so yay for that. This is the whole point of montka,
Units can normal move and advance in first 3 turns without this action failing.
The pathfinders action is started after ‘move’ (and we don’t know what that means).
What we do know is that the line of text about actions failing is now “If a unit, Advances, Falls Back, attempts to manifest a psychic power ~ that action is failed”, so for sure, no argument that the pathfinders can Normal Move or Remains Stationary and do the Markerlights action. Everyone agrees
“The Pathfinders can ‘move’ and then apply Markerlights”
Again the wording of the leak is terrible and would be clarified if the phrase “normal move” or “finish movement phase” (which includes Normal Move, Advances, Fall Back, Remains Stationary and re-enforcements) or “move unit” (which includes Normal Move, Advances, Fall Back and Remains Stationary) were used. This is what I would expect to see in the codex.
Assuming montka we would still need to know if this unit is able to declare / start performing the action relevant to the Fall Back making the pathfinders unable to declare the action.
Paraphrasing a bit here:
“You can declare a unit from your army to perform an action provided there are no enemy units within Engagement Range of it and it did not Fall Back this turn”
This is the only issue I have with it so far, if the unit is able to declare the action. If the unit is able to declare the action then it does not matter about failing the action on fall back, as it was able to declare it on fall back.
The wording of the codex is the only ting that would clarify it.